CN110681265A - Antipollution type submergence formula ultrafiltration membrane pond structure - Google Patents

Antipollution type submergence formula ultrafiltration membrane pond structure Download PDF

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Publication number
CN110681265A
CN110681265A CN201911012365.5A CN201911012365A CN110681265A CN 110681265 A CN110681265 A CN 110681265A CN 201911012365 A CN201911012365 A CN 201911012365A CN 110681265 A CN110681265 A CN 110681265A
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China
Prior art keywords
ultrafiltration membrane
water inlet
pipe
zone
separation
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CN201911012365.5A
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Inventor
谢喜平
马志刚
俞开昌
杨运
李天玉
车淑娟
王志栋
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Taicang Water Group Co Ltd
Beijing Originwater Technology Co Ltd
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Taicang Water Group Co Ltd
Beijing Originwater Technology Co Ltd
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Priority to CN201911012365.5A priority Critical patent/CN110681265A/en
Publication of CN110681265A publication Critical patent/CN110681265A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/18—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/20—Accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/10—Use of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/18—Use of gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations

Abstract

The invention provides an anti-pollution immersed ultrafiltration membrane pool structure, and belongs to the technical field of water supply and sewage treatment equipment. Comprises a cylindrical separation area at the upper part, an ultrafiltration membrane component is arranged in the separation area, a water inlet is arranged at one side of the separation area, and a water outlet pipe is arranged at the top of the separation area; the water outlet pipe is communicated with the ultrafiltration membrane component; the direction of the water inlet is consistent with the direction of a tangent line of the side wall of the cylindrical separation area; the lower part of the cylindrical separation area is a conical precipitation area, and an aeration pipe is arranged between the precipitation area and the isolation area. And a sludge discharge pipe is paved on the side wall of the settling zone and extends out of the junction of the separation zone and the sludge settling zone. The upper part of the invention is a conical separation area, which changes the position of the water inlet of the membrane pool and the water inlet mode, so that the inlet water can be in a rotational flow state in the membrane pool, further forms a transverse shearing force on the surface of the ultrafiltration membrane, slows down membrane pollution, and the lower part of the invention is a conical membrane pool structure, which is beneficial to the precipitation and enrichment of pollutants in the membrane pool and improves the running environment and sludge discharge conditions of the ultrafiltration membrane.

Description

Antipollution type submergence formula ultrafiltration membrane pond structure
Technical Field
The invention relates to the technical field of water supply and sewage treatment equipment, in particular to an anti-pollution immersed ultrafiltration membrane pool structure capable of retarding membrane pollution through cyclone separation.
Background
The existing immersed ultrafiltration membrane pool is usually square or the original sand filter pool is used as a membrane pool, and the pool type has the defects that water to be treated is static in the membrane pool, an ultrafiltration membrane is in a dead-end filtration state in the suction process, particles are attached to the surface of the filtration membrane, and the membrane pollution is not favorably slowed down; on the other hand, the square and flat-bottom membrane pool structure is not beneficial to the enrichment of settled pollutants at the bottom of the pool, so that the particulate matter content (SS) of the upper membrane group device area is higher, the bottom of the lower particulate matter enrichment area is horizontal, and the enrichment of particulate matters is not beneficial, thereby bringing difficulty to sludge discharge.
Disclosure of Invention
The invention aims to provide an anti-pollution immersed ultrafiltration membrane pool structure capable of reducing membrane pollution through cyclone separation, so as to solve at least one technical problem in the background technology.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides an anti-pollution immersed ultrafiltration membrane pool structure, which comprises:
the upper part is a cylindrical separation area, an ultrafiltration membrane component is arranged in the separation area, a water inlet is arranged on one side of the separation area, and a water outlet pipe is arranged at the top of the separation area; the water outlet pipe is communicated with the ultrafiltration membrane component;
an overflow pipe is arranged on one side of the upper end of the separation area;
the direction of the water inlet is consistent with the tangential direction of the cylindrical separation area; the outer side of the water inlet is communicated with a water inlet pipe;
the lower part of the cylindrical separation zone is an inverted cone-shaped precipitation zone, an aeration pipe is arranged between the precipitation zone and the isolation zone, and the aeration pipe is positioned below the water inlet and the ultrafiltration membrane component;
and a sludge discharge pipe is paved on the side wall of the settling zone and extends out of the bottom of the separation zone.
Preferably, a guide plate is arranged in the separation area and positioned on one side of the water inlet, and the guide plate is arranged along the axial direction of the cylindrical separation area.
Preferably, the angle between the guide plate and the water inlet direction of the water inlet pipe is 30-45 degrees, the size of the guide plate is 5-10 times of the sectional area of the water inlet pipe, and the length of the guide plate is 3-5 times of the diameter of the water inlet pipe.
Preferably, the inclined direction of the opening of the aeration pipe and the included angle of the aeration pipe are inclined downwards by 45 degrees, and the flow rate of the gas outlet is more than or equal to 10 m/s.
Preferably, the radius ratio beta of the ultrafiltration membrane component to the separation area and the water inlet flow velocity u of the water inlet0And ultrafiltration membrane module radial velocity umThe relationship between them satisfies:
Figure BDA0002244575720000021
wherein R is1Denotes the radius, R, of the ultrafiltration membrane module2Denotes the radius of the separation zone, p denotes the density of the suspension in the separation zone, d denotes the diameter of the particles in the suspension, psRepresents the density of the particles in the suspension and can be calculated by testing the SS content of the suspension; μ represents the viscosity of the fluid.
Preferably, the ratio of the height to the diameter of the separation zone is 0.7-2, the ratio of the height of the separation zone to the height of the sludge settling zone is 0.5-2, and the included angle between the tank wall of the conical sludge settling zone and the horizontal plane is 45-70 degrees.
Preferably, the distance between the lower end of the sludge discharge pipe and the bottom of the conical settling zone is not more than 0.2m, and the pipe diameter of the sludge discharge pipe is not less than 100 mm.
Preferably, the overflow tube is at a distance of 0.2m from the top of the separation zone.
The invention has the beneficial effects that: the membrane pool structure of the immersed ultrafiltration is improved, the position of a water inlet of the membrane pool and a water inlet mode are changed, so that water can enter the membrane pool in a rotational flow state, a transverse shearing force is formed on the surface of the ultrafiltration membrane, membrane pollution is reduced, the lower conical membrane pool structure is favorable for precipitation and enrichment of pollutants in the membrane pool, and the running environment and sludge discharge conditions of the ultrafiltration membrane are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a front cross-sectional view of a structure of an anti-contamination submerged ultrafiltration membrane tank according to an embodiment of the present invention.
Fig. 2 is a top cross-sectional structure view of an anti-contamination submerged ultrafiltration membrane tank structure according to an embodiment of the present invention.
Fig. 3 is a schematic view of radial force analysis of suspended particles in the anti-pollution submerged ultrafiltration membrane pool structure according to the embodiment of the present invention.
Wherein: 1-a separation zone; 2-an ultrafiltration membrane module; 3-a water inlet; 4-water outlet pipe; 5-an overflow pipe; 6-water inlet pipe; 7-a precipitation zone; 8-an aerator pipe; 9-a sludge discharge pipe; 10-a deflector.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by way of the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
For the purpose of facilitating an understanding of the present invention, the present invention will be further explained by way of specific embodiments with reference to the accompanying drawings, which are not intended to limit the present invention.
It should be understood by those skilled in the art that the drawings are merely schematic representations of embodiments and that the elements shown in the drawings are not necessarily required to practice the invention.
Examples
As shown in fig. 1 to 2, an embodiment of the present invention provides an anti-pollution submerged ultrafiltration membrane pool structure, including:
the upper part is a cylindrical separation area 1, an ultrafiltration membrane component 2 is arranged in the separation area 1, a water inlet 3 is arranged on one side of the separation area 1, and a water outlet pipe 4 is arranged at the top of the separation area 1; the water outlet pipe 4 is communicated with the ultrafiltration membrane component 2;
an overflow pipe 5 is arranged on one side of the upper end of the separation area 1;
the direction of the water inlet 3 is consistent with the direction of a tangent line of the side wall of the cylindrical separation zone 1; the outer side of the water inlet 3 is communicated with a water inlet pipe 6;
the lower part of the cylindrical separation zone 1 is a conical precipitation zone 7, an aeration pipe 8 is arranged between the precipitation zone 7 and the separation zone 1, and the aeration pipe 8 is positioned below the water inlet 3 and the ultrafiltration membrane component 2;
and a sludge discharge pipe 9 is paved along the side wall of the settling zone 7, and the sludge discharge pipe 9 extends out of the bottom of the separation zone 1.
A guide plate 10 is arranged in the separation area 1, the guide plate 10 is positioned on one side of the water inlet 3, and the guide plate 10 is arranged along the axial direction of the cylindrical separation area 1.
The flow guide plate 10 and the water inlet direction of the water inlet pipe 6 form an angle of 30-45 degrees, the size of the flow guide plate 10 is 5-10 times of the sectional area of the water inlet pipe 6, and the length of the flow guide plate 10 is equal to 3-5 times of the diameter of the water inlet pipe 6.
The included angle between the opening direction of the aeration pipe 8 and the aeration pipe 8 is 45 degrees downwards in an inclined mode, and the flow speed of the gas outlet is larger than or equal to 10 m/s.
The ratio of the height to the diameter of the separation zone is 0.7-2, the ratio of the height of the separation zone to the height of the sludge settling zone is 0.5-2, and the included angle between the tank wall of the conical sludge settling zone and the horizontal plane is 45-70 degrees.
The distance between the lower end of the sludge discharge pipe and the bottom of the conical settling zone is not more than 0.2m, and the pipe diameter of the sludge discharge pipe is not less than 100 mm.
The overflow tube is at a distance of 0.2m from the top of the separation zone.
The determination of the membrane cell diameter was calculated by the following model. The particles in the membrane pool were subjected to force analysis in the horizontal direction, as shown in fig. 2. Supposing that the particles reach the membrane surface in motion, the particles are subjected to two forces in opposite directions in the horizontal direction, one is a seepage drag force Fm generated by the seepage action of the membrane surface, and the seepage drag force Fm can be obtained by a Stamatakis calculation formula,
Fm＝3πμdur(1)
wherein d is the particle diameter, m; μ is the fluid viscosity, urIs the radial velocity of the fluid in the horizontal direction in the membrane tank, m/s;
the other is the inertial centrifugal force F which promotes the particles to migrate away from the membrane surface in the reverse directionk：
In the formula, FkInertial centrifugal force, N; d is the particle diameter, m; u. ofθIs the tangential velocity of the fluid in the membrane cell, m/s; rhosAs particle density, kg/m 3; rho is the density of the suspension, kg/m 3;
the condition that solid-phase particles in the suspension do not deposit and migrate to the membrane surface is the inertial centrifugal force F on the particleskGreater than or equal to the osmotic radial drag force FmI.e. by
Fk≥Fm(3)
Since the reynolds number of a particle in the ultrafiltration range is typically less than or close to 1, the relative motion between the particle and its surrounding fluid can be considered to be laminar and in the Storks region. Approximation of the filtration and permeation rate u at the membrane surfacemInstead of radial velocity urWith R1Substitute for r to obtain
Figure BDA0002244575720000062
Wherein R is1Radius of the membrane module, m; u. ofmTaking the membrane filtration flux, m/s; rhosCalculated by testing the SS content in water.
According to the formula (4), the larger the filtering speed is, the smaller the particle size of the particles is, the smaller the solid-liquid density difference is, and the larger the tangential flow speed required for preventing the particles from depositing on the membrane surface is, and according to the formula, the minimum tangential speed of the water flow in the membrane pool can be obtained by testing the actual water quality of the inlet water and the radius of the membrane group device.
In addition, according to the theory of cyclone separation, the tangential velocity of the fluid in the membrane tank satisfies the following formula:
Figure BDA0002244575720000071
in the formula, R2Is the membrane pool radius, m; r is the distance m from any point in the gap between the membrane group device and the inner wall of the membrane pool to the center of the membrane pool;
boundary condition
Figure BDA0002244575720000072
(equal sign value), uθ(r＝R,2)＝u0Bringing into formula (5) to
Figure BDA0002244575720000073
Figure BDA0002244575720000074
Figure BDA0002244575720000075
Wherein beta is the radius R of the combiner1Radius R of membrane tank2The ratio of (A) to (B); u. of0The flow velocity of an inlet of the membrane pool is m/s; and (7) is (8) to obtain
Figure BDA0002244575720000076
By solving the formula (10), obtain
Equation (11) gives the relationship between the membrane module to membrane module radius ratio β, the membrane module inlet flow rate u0 and the membrane module radial velocity um (calculated as the filtration velocity near the membrane surface, i.e. the filtration velocity is converted from the membrane flux) in the membrane cell. According to the formula, the diameter D of the membrane pool can be calculated according to two parameters of the inflow velocity and the radial velocity of the membrane group device, the height of the columnar separation area is (0.7-2) D, and the formula is a theoretical basis of the structural design of the membrane pool.
In the embodiment, the membrane module is placed in the middle of the membrane pool, the water pump is used for pumping water to produce water, the aeration pipe 7 for physical cleaning is arranged at the junction of the sedimentation area and the sludge accumulation area, the opening position is inclined downwards at an angle of 45 degrees, and the flow rate of the gas outlet is more than or equal to 10 m/s. Therefore, the sludge accumulation area is not easy to be disturbed in the aeration process, and the sediment in the sludge accumulation area enters the sedimentation area again, so that the operation load of the membrane is increased.
Those of ordinary skill in the art will understand that: the components in the device in the embodiment of the present invention may be distributed in the device in the embodiment according to the description of the embodiment, or may be correspondingly changed in one or more devices different from the embodiment. The components of the above embodiments may be combined into one component, or may be further divided into a plurality of sub-components.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. An anti-pollution type immersed ultrafiltration membrane pool structure, comprising:
the upper part is a cylindrical separation area (1), an ultrafiltration membrane component (2) is arranged in the separation area (1), a water inlet (3) is arranged on one side of the separation area (1), and a water outlet pipe (4) is arranged at the top of the separation area (1); the water outlet pipe (4) is communicated with the ultrafiltration membrane component (2);
an overflow pipe (5) is arranged on one side of the upper end of the separation area (1);
the direction of the water inlet (3) is consistent with the direction of a tangent line of the side wall of the cylindrical separation area (1); the outer side of the water inlet (3) is communicated with a water inlet pipe (6);
the lower part of the cylindrical separation zone (1) is a conical precipitation zone (7), an aeration pipe (8) is arranged between the precipitation zone (7) and the separation zone (1), and the aeration pipe (8) is positioned below the water inlet (3) and the ultrafiltration membrane component (2);
and a sludge discharge pipe (9) is paved along the side wall of the settling zone (7), and the sludge discharge pipe (9) extends out of the bottom of the separation zone (1).
2. The anti-pollution submerged ultrafiltration membrane tank structure according to claim 1, wherein a deflector (10) is arranged in the separation zone (1), said deflector (10) is located at one side of said water inlet (3), and said deflector (10) is arranged along the axial direction of said cylindrical separation zone (1).
3. The anti-pollution submerged ultrafiltration membrane pool structure according to claim 1, wherein the angle between the flow guide plate (10) and the water inlet direction of the water inlet pipe (6) is 30-45 degrees, the size of the flow guide plate (10) is 5-10 times of the cross-sectional area of the water inlet pipe (6), and the length of the flow guide plate (10) is 3-5 times of the diameter of the water inlet pipe (6).
4. The anti-pollution submerged ultrafiltration membrane tank structure according to claim 1, wherein the angle between the opening direction of the aeration pipe (8) and the aeration pipe (8) is 45 degrees downwards, and the gas outlet flow rate is not less than 10 m/s.
5. The anti-contamination submerged ultrafiltration membrane tank structure of any of claims 1 to 4, wherein the ratio β of the radius of the ultrafiltration membrane module to the radius of the separation zone, the inlet water flow rate u of the inlet water0And ultrafiltration membrane component radial velocity umThe relationship between them satisfies:
Figure FDA0002244575710000021
wherein R is1Denotes the radius, R, of the ultrafiltration membrane module2Denotes the radius of the separation zone, p denotes the density of the suspension in the separation zone, d denotes the diameter of the particles in the suspension, psRepresents the density of the particles in the suspension and can be calculated by testing the SS content of the suspension; μ represents the viscosity of the fluid.
6. The membrane tank structure of anti-pollution submerged ultrafiltration membrane according to claim 5, wherein the ratio of the height to the diameter of the separation zone is 0.7-2, the ratio of the height of the separation zone to the height of the sludge settling zone is 0.5-2, and the angle between the tank wall of the conical sludge settling zone and the horizontal plane is 45-70 °.
7. The anti-pollution submerged ultrafiltration membrane pool structure of claim 5, wherein the distance from the lower end of said sludge discharge pipe to the bottom of said conical settling zone is not more than 0.2m, and the diameter of said sludge discharge pipe is not less than 100 mm.
8. The anti-fouling submerged ultrafiltration membrane tank structure of claim 1, wherein the overflow tube is at a distance of 0.2m from the top of the separation zone.
CN201911012365.5A 2019-10-23 2019-10-23 Antipollution type submergence formula ultrafiltration membrane pond structure Pending CN110681265A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111606481A (en) * 2020-06-16 2020-09-01 浙江开创环保科技股份有限公司 Membrane filter drinking water purification treatment device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111606481A (en) * 2020-06-16 2020-09-01 浙江开创环保科技股份有限公司 Membrane filter drinking water purification treatment device and method

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